This reverts commit e02f5611.

Reason for revert: Regresses compile time: chromium:803840

Original change's description:
> [turbofan] trim effect chain nodes when they have no side-effect
>
> Bug:
> Change-Id: Ic1b6dc6fcd8bfc4f0c3dbb101a38106aa3596a12
> Reviewed-on: https://chromium-review.googlesource.com/863886
> Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
> Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#50588}

TBR=jarin@chromium.org,tebbi@chromium.org

Change-Id: I631840ca3b79272108d5696e6dc68d671774e35c
Bug: 
Reviewed-on: https://chromium-review.googlesource.com/883521
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50833}